Compared with traditional cross-breeding and mutation breeding, the advantages of cultivating new crop varieties through modern biotechnologies such as genetic engineering and cell engineering are (

A. Genetic engineering and cell engineering have overcome the obstacle of distant hybridization incompatibility. A is correct; B. Cell engineering is a comprehensive science and technology that changes the genetic material in cells or obtains cell products according to people's wishes.

Genetic engineering is a comprehensive technology that carries out strict design according to people's wishes and creates new biological types and biological products that are more in line with people's needs. B is correct; C. Traditional cross-breeding takes a long time, while modern biotechnology breeds new crops.

Varieties take a shorter time, C is correct; D. Genetically modified organisms may cause damage to the stability of the ecosystem and the human living environment. For example, people combine the DNA of animals, plants and microorganisms and transfer them into a certain organism.

It will break the original boundaries of natural species and change the energy flow and material cycle in the ecosystem. D is wrong.

Therefore, we choose: ABC.